Algorithm 1 Branch-based layer selection with adaptive intrusion detection

Require:  Branch type $u\in \{\mathrm{human},\mathrm{machine},\mathrm{selective\_encryption},\mathrm{fully\_encrypted}\}$ Require:  Intrusion flag $\mathit{intrusion\_detected}\in \{0,1\}$ Ensure:  Activated layer list  1:$\mathit{activated\_layers}\leftarrow \left[\right]$  2:if $\mathit{intrusion\_detected}=1$ then  3:    $\mathit{activated\_layers}\leftarrow [2,3,5]$                                                ▹ Force full encryption  4:else  5:    if $u=\mathrm{human}$ then  6:        $\mathit{activated\_layers}\leftarrow [2,3]$  7:    else if $u=\mathrm{machine}$ then  8:        $\mathit{activated\_layers}\leftarrow [1,3]$  9:    else if $u=\mathrm{selective\_encryption}$ then 10:        $\mathit{activated\_layers}\leftarrow [1,3,4]$ 11:    else if $u=\mathrm{fully\_encrypted}$ then 12:        $\mathit{activated\_layers}\leftarrow [2,3,5]$ 13:    end if 14:end if 15:return $\mathit{activated\_layers}$